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The crystal chemistry of montmorillonite—I*

Published online by Cambridge University Press:  14 March 2018

Duncan McConnell
Duncan McConnell*
Affiliation:
Department of Mineralogy, Ohio State University, Columbus, Ohio
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Extract

Many analyses of montmorillonite indicate liberation of water above 300°C in excess of the amount required by the structure proposed by Hofmann, Endell and Wilm (1933). The structure of Edelman and Favejee (1940) will account for a larger quantity of water, but other inconsistencies with experimental results seem to arise.

Using as an analogy the hydrogarnets (Flint et al.; Pabst ; McConnell), it is suggested that hydroxyl ions can occur as tetrahedral groups within the silica sheets in substitution for SiO4 groups. Liberation of this "tetrahedral water" is believed to be associated with the second high-temperature endotherm which is occasionally a small deflection on the D.T.A. curve but is, nevertheless, characteristic of montmorillonite.

Type
Research Article
Information
Clay Minerals Bulletin , Volume 1 , Issue 6 , November 1951 , pp. 178 - 179
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1951

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Footnotes

*

Read at the London meeting, November 1949. Subsequently published in Amer. Min., 35, 166–172 (1950). This is an abstract by the Author.

References

Edelman, C. H., and Favejee, J. C. L., 1940. Zeits. Krist., 102A, 417–431.Google Scholar
Flint, E. P., McMurdie, H. F., and Wells, L. S., 1941. Natl. Bur. Stands., Jour. Research, 26, 13–33.CrossRefGoogle Scholar
Hofmann, U., Endell, K., and Wilm, D., 1933. Zeits. Krist., 86A, 340–347.Google Scholar
McConnell, D., 1942. Amer. Min., 27, 452–461.Google Scholar
Pabst, A., 1937. Amer. Min., 22, 861–868.Google Scholar